Wireless power transmitting device and method for controlling the same

ABSTRACT

A wireless power transmitting device is provided. The wireless power transmitting device may comprise an antenna, a memory, and a processor configured to control to store, as reference information, information of a first reflected signal of a pilot signal sent out through the antenna at a first time in the memory and control to compare the reference information with information about second reflected signals of a pilot signal sent out through the antenna at a second time, and determine a position of a target for detection based on a result of the comparison.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on and claims priority under 35 U.S.C. §119 toa Provisional U.S. patent application filed in the United States Patentand Trademark Office on Mar. 31, 2016 and assigned Ser. No. 62/315,869,and a Korean patent application filed in the Korean IntellectualProperty Office on Aug. 17, 2016 and assigned Serial No.10-2016-0104119, the disclosures of which are incorporated by referenceherein in their entireties.

TECHNICAL FIELD

The present disclosure relates generally to wireless power transmittingdevices and methods for controlling the same, and for example, towireless power transmitting devices capable of wirelessly transmittingpower to electronic devices and methods for controlling the same.

DISCUSSION OF RELATED ART

Portable digital communication devices have become must-have items formodern people. Customers desire to receive various high-quality servicesanytime, anywhere. Internet of Thing (IoT) technology recently bundlesvarious sensors, home appliances, and communication devices up into asingle network. A diversity of sensors require a wireless powertransmission system for seamless operations.

Wireless power transmission may come in various types, such as magneticinduction, magnetic resonance, and electromagnetic waves, among whichthe electromagnetic wave type may advantageously work for a few metersof remote power transmission as compared with the others.

Such electromagnetic wave type is primarily intended for remote powertransmission and may precisely determine the location of remote powerreceivers and deliver power in a most efficient way.

In order to determine the position of a target for charging, e.g., anelectronic device, a conventional electromagnetic wave scheme formsradio frequency (RF) waves in multiple directions, receivespower-related information from the electronic device, and uses thereceived information to determine the position of the electronic device.However, the formation of RF waves in multiple directions and thereception of power-related information take a significant amount oftime. In such case, it is not secured to fix the electronic device toone position. In particular, harm to human bodies raises the issue thathigh-power transmission is impossible before detecting a target forcharging.

The above information is presented as background information only toassist with an understanding of the present disclosure.

SUMMARY

In situations in which the user carries or puts on a small electronicdevice, the electronic device may be subject to frequent changes inposition. Accordingly, a quick determination as to the position of theelectronic device is a matter for efficient wireless charging. Thepresent disclosure addresses the above issues. According to an exampleembodiment of the present disclosure, a wireless power transmittingdevice capable of swiftly determining the position of an electronicdevice by sending out pilot signals in multiple directions and analyzingreflections thereof and a method for controlling the same are provided.A wireless power transmitting device capable of conducting wirelesscharging by avoiding obstacles positioned between an electronic deviceand the wireless power transmitting device and a method for controllingthe same is also provided.

According to an example embodiment of the present disclosure, a wirelesspower transmitting device may comprise an antenna, a memory, and aprocessor configured to control to store, as reference information,information about a first reflected signal of a pilot signal sent outthrough the antenna at a first time in the memory, control to comparethe reference information with information about second reflectedsignals of a pilot signal sent out through the antenna at a second time,and determine a position of a target for detection based on a result ofthe comparison.

According to an example embodiment of the present disclosure, a methodfor controlling a wireless power transmitting device may comprisestoring, as reference information, information about a first reflectedsignal of a pilot signal sent out at a first time, sending out a pilotsignal at a second time, and comparing the reference information withinformation about second reflected signals of the pilot signal sent outat the second time; and determining a position of a target for detectionbased on a result of the comparison.

According to an example embodiment of the present disclosure, a wirelesspower transmitting device may comprise a plurality of antennas, acommunication circuit, and a processor configured to control to receive,through the communication circuit, a first communication signal from afirst antenna of an electronic device, and to receive, through thecommunication circuit, a second communication signal from a secondantenna of the electronic device, and determine whether an obstacle ispositioned between the electronic device and the wireless powertransmitting device based on a first time of reception of the firstcommunication signal and a second time of reception of the secondcommunication signal, and upon determining that the obstacle ispositioned between the electronic device and the wireless powertransmitting device, control to transmit, through the plurality ofantennas, power to the electronic device while avoiding the obstacle.

According to an example embodiment of the present disclosure, a methodfor controlling a wireless power transmitting device may comprisereceiving a first communication signal from a first antenna of anelectronic device, receiving a second communication signal from a secondantenna of the electronic device, determining whether an obstacle ispositioned between the electronic device and the wireless powertransmitting device based on a first time of reception of the firstcommunication signal and a second time of reception of the secondcommunication signal, and upon determining that the obstacle ispositioned between the electronic device and the wireless powertransmitting device, transmitting power to the electronic device whileavoiding the obstacle.

Other aspects, advantages, and salient features of the disclosure willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses example embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

to the above and other aspects, features and attendant advantages of thepresent disclosure will be apparent and more readily appreciated fromthe following detailed description, taken in conjunction with theaccompanying drawings, in which like reference numerals refer to likeelements, and wherein:

FIG. 1 is a diagram illustrating an example wireless power transmissionsystem according to an example embodiment of the present disclosure;

FIG. 2 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 3 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIGS. 4A, 4B and 4C are plan views illustrating a particular area wherea wireless power transmitting device is positioned according to anexample embodiment of the present disclosure;

FIG. 5 is a diagram illustrating example transmission of a pilot signalaccording to an example embodiment of the present disclosure;

FIG. 6 is a block diagram illustrating an example wireless powertransmitting device according to an example embodiment of the presentdisclosure;

FIG. 7 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 8 is a block diagram illustrating example division of reflectedsignals according to an example embodiment of the present disclosure;

FIG. 9 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 10 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 11 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIGS. 12A and 12B are flowcharts illustrating an example method forcontrolling a wireless power transmitting device according to an exampleembodiment of the present disclosure;

FIG. 13 is a diagram illustrating example formation of a RF wave by awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 14 is a flowchart illustrating example charging a plurality ofelectronic devices according to an example embodiment of the presentdisclosure;

FIGS. 15A and 15B are plan views illustrating an area including awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 15C is a diagram illustrating an example charging period and adetection period according to an example embodiment of the presentdisclosure;

FIG. 16 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIGS. 17A and 17B are plan views illustrating an area including awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 18 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIGS. 19A and 19B are plan views illustrating an area including awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 20 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 21 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIG. 22 is a flowchart illustrating an example method for forming a RFwave through an avoidance path according to an example embodiment of thepresent disclosure;

FIGS. 23A and 23B are plan views illustrating an area including awireless power transmitting device according to an example embodiment ofthe present disclosure;

FIGS. 24A and 24B are concept views illustrating an example method fordetecting an obstacle according to an example embodiment of the presentdisclosure;

FIG. 25 is a flowchart illustrating an example method for detecting anobstacle according to an example embodiment of the present disclosure;and

FIG. 26 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

Throughout the drawings, like reference numerals will be understood torefer to like parts, components, and structures.

DETAILED DESCRIPTION

Hereinafter, various example embodiments of the present disclosure aredescribed with reference to the accompanying drawings. However, itshould be appreciated that the present disclosure is not limited to theexample embodiments and the terminology used herein, and all changesand/or equivalents or replacements thereto also belong to the scope ofthe present disclosure. The same or similar reference denotations may beused to refer to the same or similar elements throughout the disclosureand the drawings. It is to be understood that the singular forms “a,”“an,” and “the” include plural references unless the context clearlydictates otherwise. As used herein, the terms “A or B” or “at least oneof A and/or B” may include all possible combinations of A and B. As usedherein, the terms “first” and “second” may modify various componentsregardless of importance and/or order and are used to distinguish acomponent from another without limiting the components. It will beunderstood that when an element (e.g., a first element) is referred toas being (operatively or communicatively) “coupled with/to,” or“connected with/to” another element (e.g., a second element), it can becoupled or connected with/to the other element directly or via a thirdelement.

As used herein, the terms “configured to” may be interchangeably usedwith other terms, such as “suitable for,” “capable of,” “modified to,”“made to,” “adapted to,” “able to,” or “designed to” in hardware orsoftware or a combination thereof in the context. Rather, the term“configured to” may mean that a device can perform an operation togetherwith another device or parts. For example, the term “processorconfigured (or set) to perform A, B, and C” may refer to ageneric-purpose processor (e.g., a CPU or application processor) thatmay perform the operations by executing one or more software programsstored in a memory device or a dedicated processor (e.g., an embeddedprocessor) for performing the operations.

For example, examples of the wireless power transmitting device orelectronic device according to various example embodiments of thepresent disclosure may include at least one of a smartphone, a tabletpersonal computer (PC), a mobile phone, a video phone, an e-book reader,a desktop PC, a laptop computer, a netbook computer, a workstation, aserver, a personal digital assistant (PDA), a portable multimedia player(PMP), a MP3 player, a medical device, a camera, or a wearable device,or the like, but are not limited thereto. The wearable device mayinclude at least one of an accessory-type device (e.g., a watch, a ring,a bracelet, an anklet, a necklace, glasses, contact lenses, or ahead-mounted device (HMD)), a fabric- or clothes-integrated device(e.g., electronic clothes), a body attaching-type device (e.g., a skinpad), or a body implantable device, or the like, but is not limitedthereto. In some example embodiments, examples of the wireless powertransmitting device or electronic device may include at least one of atelevision, a digital video disk (DVD) player, an audio player, arefrigerator, an air conditioner, a cleaner, an oven, a microwave oven,a washer, a drier, an air cleaner, a set-top box, a home automationcontrol panel, a security control panel, a media box, a gaming console,an electronic dictionary, an electronic key, a camcorder, or anelectronic picture frame, or the like, but is not limited thereto.

According to an example embodiment of the present disclosure, examplesof the wireless power transmitting device or electronic device mayinclude at least one of various medical devices (e.g., diverse portablemedical measuring devices (a blood sugar measuring device, a heartbeatmeasuring device, or a body temperature measuring device), a magneticresource angiography (MRA) device, a magnetic resource imaging (MRI)device, a computed tomography (CT) device, an imaging device, or anultrasonic device), a navigation device, a global navigation satellitesystem (GNSS) receiver, an event data recorder (EDR), a flight datarecorder (FDR), an automotive infotainment device, an sailing electronicdevice (e.g., a sailing navigation device or a gyro compass), avionics,security devices, vehicular head units, industrial or home robots,drones, automatic teller's machines (ATMs), point of sales (POS)devices, or internet of things (IoT) devices (e.g., a bulb, varioussensors, a sprinkler, a fire alarm, a thermostat, a street light, atoaster, fitness equipment, a hot water tank, a heater, or a boiler), orthe like, but is not limited thereto. According to various exampleembodiments of the disclosure, examples of the wireless powertransmitting device or electronic device may at least one of part of apiece of furniture, building/structure or vehicle, an electronic board,an electronic signature receiving device, a projector, or variousmeasurement devices (e.g., devices for measuring water, electricity,gas, or electromagnetic waves), or the like, but are not limitedthereto. According to example embodiments of the present disclosure, thewireless power transmitting device or electronic device may be flexibleor may be a combination of the above-enumerated electronic devices.According to an example embodiment of the present disclosure, thewireless power transmitting device or electronic device is not limitedto the above-listed embodiments. As used herein, the term “user” mayrefer to a human using the electronic device or another device (e.g., anartificial intelligent electronic device) using the wireless powertransmitting device or electronic device.

FIG. 1 is a diagram illustrating an example wireless power transmissionsystem according to an example embodiment of the present disclosure.

The wireless power transmitting device 100 may wirelessly transmit powerto at least one electronic device 150 or 160. According to an embodimentof the present disclosure, the wireless power transmitting device 100may include a plurality of patch antennas 111 to 126. The patch antennas111 to 126 are not limited as long as they each are an antenna capableof generating RF waves. At least one of the amplitude and phase of RFwaves generated by the patch antennas 111 to 126 may be adjusted by thewireless power transmitting device 100. For ease of description, the RFwave generated by single patch antenna may be referred to as sub-RFwaves.

According to an example embodiment of the present disclosure, thewireless power transmitting device 100 may adjust at least one of theamplitude and phase of each of the sub-RF waves generated by the patchantennas 111 to 126 respectively. Meanwhile, the sub-RF waves mayinterfere with each other. For example, the sub-RF waves mayconstructively interfere with each other at one point or destructivelyinterfere with each other at another point. According to an embodimentof the present disclosure, the wireless power transmitting device 100may adjust at least one of the amplitude and phase of each of the sub-RFwaves generated by the patch antennas 111 to 126 so that the sub-RFwaves may constructively interfere with each other at a first point (x1,y1, z1).

For example, the wireless power transmitting device 100 may determinethat an electronic device 150 is positioned at the first point (x1, y1,z1). Here, the position of the electronic device 150 may be the positionwhere, e.g., a power receiving antenna of the electronic device 150 islocated. A method for determining the position of the electronic device150 is described below in greater detail. In order for the electronicdevice 150 to wirelessly receive power at a higher transmissionefficiency, the sub-RF waves should constructively interfere with eachother at the first point (x1, y1, z1). Accordingly, the wireless powertransmitting device 100 may control the patch antennas 111 to 126 sothat the sub-RF waves may constructively interfere with each other atthe first point (x1, y1, z1). For example, controlling the patchantennas 111 to 126 may refer, for example, to controlling the magnitudeof signals input to the patch antennas 111 to 126 or controlling thephase (or delay) of signals input to the patch antennas 111 to 126.Meanwhile, beamforming, a technique for controlling RF waves to besubject to constructive interference at a certain point, would readilybe appreciated by one of ordinary skill in the art. It is alsoappreciated by one of ordinary skill in the art that the beamformingused herein is not particularly limited in type. For example, variousbeamforming methods may be adopted as disclosed in U.S. PatentApplication Publication No. 2016/0099611, U.S. Patent ApplicationPublication No. 2016/0099755, and U.S. Patent Application PublicationNo. 2016/0100124. An RF wave formed by beamforming may be referred to,for example, as a pocket of energy.

An RF wave 130 formed by the sub-RF waves may have the maximum and/orsubstantially large amplitude at the first point (x1, y1, z1), and thus,the electronic device 150 may receive power at a higher efficiency.Meanwhile, the wireless power transmitting device 100 may detect that anelectronic device 160 is positioned at a second point (x2, y2, z2). Thewireless power transmitting device 100 may control the patch antennas111 to 126 so that the sub-RF waves may constructively interfere witheach other at the second point (x2, y2, z2) to charge the electronicdevice 160. An RF wave 131 formed by the sub-RF waves may have themaximum and/or substantially large amplitude at the second point (x2,y2, z2), and thus, the electronic device 160 may receive power at ahigher efficiency.

For example, the electronic device 150 may be positioned relatively at aright side. In this case, the wireless power transmitting device 100 mayapply a relatively larger delay to sub-RF waves formed by the patchantennas (e.g., 114, 118, 122, and 126) positioned relatively at a rightside. In other words, a predetermined time after the sub-RF waves areformed by patch antennas (e.g., 111, 115, 119, and 123) positionedrelatively at a left side, sub-RF waves may be generated by the patchantennas (e.g., 114, 118, 122, and 126) positioned relatively at a rightside. Thus, the sub-RF waves may simultaneously meet at a relativelyright-side point. In other words, the sub-RF waves may constructivelyinterfere with each other at the relatively right-side point. Wherebeamforming is conducted at a relatively middle point, the wirelesspower transmitting device 100 may apply substantially the same delay tothe left-side patch antennas (e.g., 111, 115, 119, and 123) and theright-side patch antennas (e.g., 114, 118, 122, and 126). Further, wherebeamforming is conducted at a relatively left-side point, the wirelesspower transmitting device 100 may apply a larger delay to the left-sidepatch antennas (e.g., 111, 115, 119, and 123) than to the right-sidepatch antennas (e.g., 114, 118, 122, and 126). Meanwhile, according toan example embodiment of the present disclosure, the wireless powertransmitting device 100 may substantially simultaneously generate sub-RFwaves through all of the patch antennas 111 to 126 and may performbeamforming by, for example, adjusting the phase corresponding to theabove-described delay.

As set forth above, the wireless power transmitting device 100 maydetermine the position of the electronic devices 150 and 160 and enablethe sub-RF waves to constructively interfere with each other at thedetermined position, allowing for wireless charging at a highertransmission efficiency. Meanwhile, the wireless power transmittingdevice 100 may be capable of high-transmission efficiency wirelesscharging when it can more precisely determine the position of theelectronic devices 150 and 160.

FIG. 2 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure. Hereinafter, the wireless power transmittingdevice performs a particular operation may refer, for example, to asituation in which a processor of the wireless power transmitting deviceperforms a particular operation or the processor controls other hardwareunits to perform a particular operation. Further, the wireless powertransmitting device stores particular information may refer, forexample, to a situation in which a memory in the wireless powertransmitting device stores particular information.

In operation 210, the wireless power transmitting device may detect anelectronic device. According to an example embodiment of the presentdisclosure, the wireless power transmitting device may send out pilotsignals in multiple directions. The wireless power transmitting devicemay receive reflected signals of the pilot signals. The wireless powertransmitting device may previously store, as reference information,information about a reflected signal, e.g., a signal characteristic,e.g., at least one of the amplitude, phase, and time of flight of thereflected signal. Accordingly, the wireless power transmitting devicemay store a signal characteristic corresponding to the area where thewireless power transmitting device is positioned. Where an additionalobject, similar to the electronic device, is positioned, the signalcharacteristic may become different than before. The wireless powertransmitting device may send out pilot signals in multiple directionsand may compare the characteristic of a reflected signal with pre-storedreference information. When there is a difference between the reflectedsignal and the reference information, the wireless power transmittingdevice may detect the electronic device. Meanwhile, the wireless powertransmitting device may determine whether a target for detection is theelectronic device or an obstacle, which is described below in greaterdetail.

In operation 220, the wireless power transmitting device may determinethe position of the electronic device. According to an exampleembodiment of the present disclosure, the wireless power transmittingdevice may determine the direction in which the electronic device ispositioned. A configuration in which the wireless power transmittingdevice determines the position of the electronic device or the directionin which the electronic device is positioned is described below ingreater detail.

In operation 230, the wireless power transmitting device may form a RFwave corresponding to the position of the electronic device. Accordingto an example embodiment of the present disclosure, the wireless powertransmitting device may form a RF wave in the direction along which theelectronic device is positioned. Here, the wireless power transmittingdevice forms a RF wave in the direction along which the electronicdevice is positioned may refer, for example, to controlling at least oneof the phase and amplitude of each of patch antennas so that sub-RFwaves may constructively interfere with each other at one or more pointswhere the electronic device is positioned. For example, the wirelesspower transmitting device may control at least one phase shifterincluded or connected to the power transmission antenna array to form aRF wave in a particular direction. For example, the wireless powertransmitting device may control each gain of at least one poweramplifier included or connected to the power transmission antenna arrayto form a RF wave in a particular direction.

The wireless power transmitting device may receive, from the electronicdevice, RX (receive) power-related information that the electronicdevice has received, and accordingly, the wireless power transmittingdevice may continue or maintain forming the RF wave or adjust and reformthe RF wave. For example, when the received power-related informationmeets a preset condition, the wireless power transmitting device maycontinue forming the RF wave. Unless the received power-relatedinformation meets the preset condition, the wireless power transmittingdevice may reform the RF wave by adjusting the magnitude of powerapplied to the patch antennas. In other words, the wireless powertransmitting device may adjust the RF wave until the receivedpower-related information received from the electronic device meets thepreset condition. According to an example embodiment of the presentdisclosure, the wireless power transmitting device may directlydetermine the position of the electronic device. In this case, thewireless power transmitting device may control at least one of the phaseand amplitude of each of the patch antennas so that the sub-RF wavesconstructively interfere with each other at the position of theelectronic device. In operation 240, the wireless power transmittingdevice may conduct wireless charging using the formed RF wave.

FIG. 3 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure. The embodiment illustrated in FIG. 3 isdescribed in further detail with reference to FIGS. 4A, 4B and 4C. FIGS.4A, 4B and 4C are plan views illustrating a particular area where awireless power transmitting device is positioned according to an exampleembodiment of the present disclosure.

The wireless power transmitting device 401 may be positioned at thecenter of a particular area 400 as illustrated in, e.g., FIG. 4A. Theparticular area 400 may include four walls 413, 414, 415, and 416constituting a room. A television (TV) 411 may be positioned at an upperside of the particular area 400, and a piece of furniture 412 may bepositioned at a right side. The distance between the wireless powertransmitting device 401 and the TV 411 may be d1, and the distancebetween the wireless power transmitting device 401 and the piece offurniture 412 may be d3. Further, the distance between the wirelesspower transmitting device 401 and the walls 413, 414, 415, and 416 maybe d2 or d4 to d8 depending on directions.

Referring to FIG. 3, the wireless power transmitting device 401 may sendout pilot signals in a plurality of directions at a first time inoperation 310. For example, as illustrated in FIG. 4B, the wirelesspower transmitting device 401 may send out pilot signals 421, 423, 425,427, 430, 432, 434, and 436, respectively, in first to eighthdirections. According to an example embodiment of the presentdisclosure, the wireless power transmitting device 401 may send out eachof the pilot signals 421, 423, 425, 427, 430, 432, 434, and 436 at onetime. In this case, the wireless power transmitting device 401 mayinsert identification information into each pilot signal 421, 423, 425,427, 430, 432, 434, and 436 and send out them. Or, the wireless powertransmitting device 401 may send out each pilot signal 421, 423, 425,427, 430, 432, 434, and 436 at a different frequency. Or, the wirelesspower transmitting device 401 may send out each pilot signal 421, 423,425, 427, 430, 432, 434, and 436 in order of time.

In operation 320, the wireless power transmitting device 401 may receivea plurality of reflected signals. For example, as illustrated in FIG. 4b, a first pilot signal 421 may be sent out from the wireless powertransmitting device 401 and may then be reflected by the TV 411.Accordingly, the reflected signal 422 may be received by the wirelesspower transmitting device 401. As compared with the pilot signal 421sent out, the reflected signal 422 may have at least one of its phaseand amplitude varied. Further, the wireless power transmitting device401 may determine the time of flight which is a difference between thetime of transmission of the pilot signal 421 and the time of receptionof the reflected signal 422.

Meanwhile, the wireless power transmitting device 401 may receive asignal 429 that is generated as the pilot signal 427 is first reflected(428) by one wall 414 and is second reflected (429) by another wall 415.As described above, the wireless power transmitting device 401 mayreceive reflected signals 422, 424, 426, 429, 431, 433, 435, and 437respectively corresponding to the pilot signals 421, 423, 425, 427, 430,432, 434, and 436 sent out. The wireless power transmitting device 401may determine whether the reflected signals 422, 424, 426, 429, 431,433, 435, and 437 respectively correspond to the pilot signals 421, 423,425, 427, 430, 432, 434, and 436, based on at least one of theidentification information and frequency. Or, the wireless powertransmitting device 401 may determine whether the reflected signals 422,424, 426, 429, 431, 433, 435, and 437 respectively correspond to thepilot signals 421, 423, 425, 427, 430, 432, 434, and 436, according totime divisions.

In operation 330, the wireless power transmitting device 401 may storereference information for a plurality of directions. For example, thewireless power transmitting device 401 may store reference informationas shown in Table 1.

TABLE 1 Amplitude attenuation Phase change Time of flight Direction (dB)(rad) (μs) First −2 +13 0.12 direction Second −4 −2 0.24 direction Third−3 +17 0.15 direction Fourth −4.1 −3 0.28 direction

As set forth above, the reference information may include informationabout at least one of the amplitude, phase, and time of flight. However,it will be appreciated by one of ordinary skill in the art that thereference information is not limited as long as it is informationindicating the characteristic of a signal, such as radar cross section(RCS). It will also be appreciated by one of ordinary skill in the artthat the wireless power transmitting device 401 may determine thecharacteristic of a signal using various signal processing methods, suchas AM-AM noise, AM-PM noise, or IQ signaling. IQ signaling is primarilyused in signal modulation/demodulation schemes, such as phase-shiftkeying (PSK), code division multiple access (CDMA), wideband CDMA(WCDMA), or orthogonal frequency division multiplexing (OFDM). PSK maybe able to more exactly determine distorted information using amodulation scheme, such as binary PSK (BPSK), quadrature PSK (QPSK), or8PSK. Accordingly, robustness can be secured for correction of diversitydue to multi-path reflection, which is described below in greater detailwith reference to FIG. 8.

Meanwhile, the wireless power transmitting device 401 may share thereference information as shown in Table 1 with another wireless powertransmitting device or another electronic device. Having received thereference information, the electronic device may correct the referenceinformation considering its relative position and a relative position ofthe wireless power transmitting device 401 and may use the correctedreference information.

Meanwhile, according to an example embodiment of the present disclosure,the wireless power transmitting device 401 may receive referenceinformation from another electronic device. For example, anotherelectronic device processing the transmission of a radio pilot signaland the signal characteristic of a reflected wave may be implementedseparately from the wireless power transmitting device 401. In thiscase, the other electronic device may generate reference information,such as that shown in, e.g., Table 1, and transfer the referenceinformation to the wireless power transmitting device 401. In this case,the other electronic device may continue to process the transmission ofthe pilot signal and signal characteristic of the reflected signal, andwhen a variation in the reflected wave signal characteristic occurs, itmay deliver information about the direction in which the variationoccurs to the wireless power transmitting device 401. The wireless powertransmitting device 401 may correct the direction information receivedfrom the other electronic device with respect to the wireless powertransmitting device 401 and use the corrected information. According toan embodiment of the present disclosure, the other electronic device mayalso detect an obstacle or the electronic device using the signalcharacteristic of the reflected signal. According to an embodiment ofthe present disclosure, the other electronic device may transfer onlythe signal characteristic of the reflected wave to the wireless powertransmitting device 401, and the wireless power transmitting device 401may detect the obstacle or electronic device using the signalcharacteristic of the reflected wave received from the other electronicdevice.

The wireless power transmitting device 401 may compare the amplitude ofa pilot signal 421 in a first direction with the amplitude of areflected signal 422 corresponding to the pilot signal 421 to determinean amplitude attenuation. The wireless power transmitting device 401 maycompare the phase of the pilot signal 421 in the first direction withthe phase of the reflected signal 422 corresponding to the pilot signal421 to determine a phase variation. The wireless power transmittingdevice 401 may determine a time of flight using a difference between thetime of transmission of the pilot signal 421 in the first direction andthe time of reception of the reflected signal 422 corresponding to thepilot signal 421.

In operation 340, the wireless power transmitting device 401 may sendout pilot signals in a plurality of directions at a second time. Forexample, the electronic device 450 may be positioned in an area 400 atthe second time as illustrated in FIG. 4C. The electronic device 450 maybe positioned at a distance d9 in a fourth direction with respect to thewireless power transmitting device 401. The wireless power transmittingdevice 401 may send out a pilot signal 427 in the fourth direction.Although the other pilot signals 421, 423, 425, 430, 432, 434, and 436are not shown for ease of description, the wireless power transmittingdevice 401 may send out the pilot signals 421, 423, 425, 427, 430, 432,434, and 436 in a plurality of directions as illustrated in FIG. 4B.Meanwhile, the reflection 441 of the pilot signal 427 by the electronicdevice 450 may be received by the wireless power transmitting device401. The wireless power transmitting device 401 may determine thecharacteristic of the reflected signal 441. In operation 350, thewireless power transmitting device 401 may detect the electronic device450 for wireless charging by referring to reference information. Forexample, the reference information in the fourth direction as shown inTable 1 may be subject to a signal attenuation of −4.1 dB, a phasevariation of −3 rad, and a time of flight of 0.28 μs. Meanwhile, thewireless power transmitting device 401 may determine that the reflectedsignal 444 at the second time is subject to a signal attenuation of −1.2dB, a phase variation of 40 rad, and a time of flight of 0.12 μs, ascompared with the pilot signal 427. In other words, the wireless powertransmitting device 401 may identify detection of a difference of 2.9 dBfor signal attenuation, a difference of 43 rad for phase variation, anda difference of 0.16 μs for time of flight. Upon determining that thedifference in characteristic between the reference information and thereflected signal exceeds a threshold, the wireless power transmittingdevice 401 may determine that the electronic device 450 is positioned inthe corresponding direction. According to an embodiment of the presentdisclosure, the wireless power transmitting device 401 may performcomparison with a threshold set for each factor with each difference insignal attenuation, phase variation, and time of flight, or the wirelesspower transmitting device 401 may conduct, using a sum of weights,comparison with a threshold set corresponding thereto. According to anembodiment of the present disclosure, upon detecting a differenceexceeding the threshold, the wireless power transmitting device 401 maydetermine that an obstacle, not the electronic device 450, is positionedin the corresponding direction. In other words, the electronic device450 may determine whether an object detected in the correspondingdirection is the electronic device or the obstacle, which is describedbelow in greater detail.

Meanwhile, according to an embodiment of the present disclosure, thewireless power transmitting device 401 may use only reflected signalshaving a time of flight within a preset threshold in generatingreference information or detecting the electronic device 450. Althoughnot shown, the pilot signal may be received by the wireless powertransmitting device 401 after undergoing multiple times of reflection.The signal having undergone the multiple times of reflection may have arelatively large time of flight or a relatively large degree ofattenuation, and accordingly, it may not reflect the actual topographyof the area 400. Therefore, the wireless power transmitting device 401may use only reflected signals having a time of flight within a presetthreshold in generating reference information or detecting theelectronic device 450. Or, the wireless power transmitting device 401may carry out generation of reference information or detection of theelectronic device 450 using various conventional reflection correctingmethods (e.g., diversity correcting methods).

FIG. 5 is diagram illustrating example transmission of a pilot signalaccording to an example embodiment of the present disclosure. Asillustrated in FIG. 5, the wireless power transmitting device mayperform pilot signal transmission using some of a plurality of patchantennas so that sub-RF waves are formed in a single direction. Forexample, some patch antennas 111, 112, 115, and 116 may form a sub-RFwave 511 in a first direction, some patch antennas 113, 114, 117, and118 may form a sub-RF wave 512 in a second direction, some patchantennas 119, 120, 123, and 124 may form a sub-RF wave 513 in a thirddirection, and other patch antennas 121, 122, 125, and 126 may form asub-RF wave 514 in a fourth direction.

FIG. 6 is a block diagram illustrating an example wireless powertransmitting device according to an example embodiment of the presentdisclosure.

A wireless power transmitting device 600 may include a power source 601,a power transmission antenna array (or an antenna array for powertransmission) 610, a processor (e.g., including processing circuitry)620, a memory 660, and a communication circuit 640. An electronic device650 is not limited as long as it is a device capable of wirelesslyreceiving power and may include a power reception antenna (or an antennafor power reception) 651, a rectifier 652, a converter 653, a charger654, a processor (e.g., including processing circuitry) 655, a memory656, and a communication circuit 657.

The power source 601 may provide power for transmission to the powertransmission antenna array 610. The power source 601 may provide, e.g.,direct current (DC) power, in which case the wireless power transmittingdevice 600 may further include an inverter (not shown) that converts DCpower into alternating current (AC) power and delivers the AC power tothe power transmission antenna array 610. Meanwhile, according to anembodiment of the present disclosure, the power source 601 may provideAC power to the power transmission antenna array 610.

The power transmission antenna array 610 may include a plurality ofpatch antennas. For example, a plurality of patch antennas asillustrated in FIG. 1 may be included in the power transmission antennaarray 610. The number or array form of the plurality of patch antennasis not limited. The power transmission antenna array 610 may form a RFwave using the power received from the power source 601. The powertransmission antenna array 610 may form a RF wave in a particulardirection under the control of the processor 620. Here, forming a RFwave in a particular direction may refer, for example, to controlling atleast one of the amplitude and phase of sub-RF waves so that the sub-RFwaves constructively interfere with each other at a point in theparticular direction.

The processor 620 may control the power transmission array antenna 610to form sub-RF waves, e.g., pilot signals, in a plurality of directions,respectively. The memory 630 may store a program or algorithm thatgenerates the sub-RF waves, e.g., pilot signals, in the plurality ofdirections, respectively. The processor 620 may control at least one ofthe phase and amplitude of each patch antenna of the power transmissionarray antenna 610 using the program or algorithm stored in the memory630.

The processor 620 may control the wireless power transmitting device 600so that the sub-RF waves, e.g., pilot signals, are formed during a firstperiod. The processor 620 may control the patch antennas of the powertransmission array antenna 610 to receive reflected signals during asecond period after the first period. As set forth above, the patchantennas may receive reflected signals, and the processor 620 maydetermine which pilot signal each reflected signal corresponds to. Theprocessor 620 may determine the signal characteristic of each reflectedsignal. The processor 620 may store information, e.g., signalcharacteristic, about each reflected signal, as reference information,in the memory 630.

The processor 620 may control the wireless power transmitting device 600so that the sub-RF waves, e.g., pilot signals, are formed during adetection period. For example, the wireless power transmitting device600 may be configured to conduct transmission of a pilot signal andreception of a reflected signal during the detection period to detect atarget for detection to be charged. Further, the wireless powertransmitting device 600 may charge a detected electronic device during acharging period.

The processor 620 may control the patch antennas of the powertransmission array antenna 610 to receive reflected signals. Theprocessor 620 may determine the signal characteristic of each reflectedsignal. The processor 620 may compare the signal characteristic of eachreflected signal with reference information. The processor 620 maydetermine at least one of the direction and position of the target fordetection based on a result of the comparison. The processor 620 mayidentify whether the target for detection is the electronic device 650capable of wireless charging or an obstacle incapable of wirelesscharging. For example, the processor 620 may identify whether the targetis the electronic device 650 or the obstacle depending on whether thecommunication circuit 640 receives a communication signal 659 from thecommunication circuit 657 of the electronic device 650. The processor620 may perform wireless charging on the electronic device 650. Further,the processor 620 may reflect the detected target on the referenceinformation. The electronic device 650 may send out a communicationsignal 659 through the communication circuit 657 as it receives a pilotsignal. The pilot signal may have as high a magnitude as it can wake upat least the communication circuit 657 or the communication 657 and theprocessor 655.

The processor 620 may determine the direction in which the electronicdevice 650 is positioned and determine the direction of formation of theRF wave based on the determined direction. In other words, the processor620 may control the patch antennas of the power transmission antennaarray 610 that generates sub-RF waves so that the sub-RF wavesconstructively interfere with each other at one point in the determineddirection. For example, the processor 620 may control at least one ofthe amplitude and phase of the sub-RF wave generated from each patchantenna by controlling the patch antennas or a control means connectedwith the patch antennas.

The processor 620 may form a RF wave in the direction of the electronicdevice 650 by controlling the power transmission antenna array 610 or atleast one phase shifter or at least one power amplifier connected to thepower transmission antenna array 610 based on the direction of theelectronic device 650. Meanwhile, the processor 620 may identify theelectronic device 650 using information contained in the communicationsignal 659. The communication signal 659 may include the uniqueidentifier and unique address of the electronic device. Thecommunication circuit 640 may process the communication signal 659 andprovide information to the processor 620. The communication circuit 640and the communication antennas (not shown) may be manufactured based onvarious communication schemes, such as wireless-fidelity (Wi-Fi),bluetooth, zig-bee, near-field communication (NFC), and bluetooth lowenergy (BLE), which are not limited to a particular type. Meanwhile, thecommunication signal 659 may include rated power information about theelectronic device 650. The processor 620 may determine whether to chargethe electronic device 650 based on at least one of the uniqueidentifier, unique address, and rated power information of theelectronic device 650.

Further, the communication signal may be used in the process for thewireless power transmitting device 600 to identify the electronic device650, the process of permitting power transmission to the electronicdevice 650, the process of sending a request for RX power-relatedinformation to the electronic device 650, and the process of receivingthe received power-related information from the electronic device 650.In other words, the communication signal may be used in a process for asubscription, command, or request between the wireless powertransmitting device 600 and the electronic device 650.

Meanwhile, the processor 620 may control the power transmission antennaarray 610 to form a RF wave 611 in the determined direction of theelectronic device 650. The processor 620 may form a RF wave fordetection and determine the distance to the electronic device 650 usinganother communication signal subsequently received as a feedback. Forexample, the other communication signal may include a time stamp at thetime of transmission. The processor 620 may determine the distance tothe electronic device 650 by comparing the time of reception with thetime stamp included in the other communication signal.

Thus, the processor 620 may determine both the direction of theelectronic device 650 and the distance to the electronic device 650 andmay thus determine the position of the electronic device 650. Theprocessor 620 may control the patch antennas so that the sub-RF wavesgenerated from the patch antennas may constructively interfere with eachother at the position of the electronic device 650. Therefore, the RFwave 611 may be transferred to the power reception antenna 651 at arelatively high transmission efficiency.

The power reception antenna 651 is not limited as long as it is anantenna capable of receiving RF waves. Further, the power receptionantenna 651 may be implemented in the form of an array of a plurality ofantennas. The AC power received by the power reception antenna 651 maybe rectified into DC power by the rectifier 652. The converter 653 mayconvert the DC power into a voltage required and provide the voltage tothe charger 654. The charger 654 may charge a battery (not shown).Although not shown, the converter 653 may provide the converted power toa power management integrated circuit (PMIC) (not shown), and the PMIC(not shown) may provide power to various hardware structures of theelectronic device 650. According to another embodiment, the electronicdevice 650 may not comprise the charger 654. In this embodiment, theconverter 353 may directly charge the battery of the electronic device650.

Meanwhile, the processor 655 may monitor the voltage at the output endof the rectifier 652. For example, the electronic device 650 may furtherinclude a voltage meter connected to the output end of the rectifier652. The processor 655 may receive a voltage value from the voltagemeter and monitor the voltage at the output end of the rectifier 652.The processor 655 may provide information containing the voltage valueat the output end of the rectifier 652 to the communication circuit 657.The communication circuit 657 may send out the communication signalincluding RX power-related information using the communication antenna(not shown). The received power-related information may be informationassociated with the magnitude of power received, such as, e.g., thevoltage at the output end of the rectifier 652, and may contain themagnitude of a current at the output end of the rectifier 652. In thiscase, it will readily be appreciated by one of ordinary skill in the artthat the electronic device 650 may further include a current meter orvoltage meter capable of measuring current at the output end of therectifier 652. The current meter may be implemented in various types,such as a DC current meter, AC current meter, or digital current meter,without limited in type thereto. The voltage meter may be implemented invarious types, such as an electrodynamic instrument voltage meter, anelectrostatic voltage meter, or a digital voltage meter, without limitedin type thereto. Further, the received power-related information may bemeasured at any point of the electronic device 650, but not only at theoutput end of the rectifier 652.

Further, as set forth above, the processor 657 may send out acommunication signal 659 containing identification information about theelectronic device 650 to the wireless power transmitting device 600. Thememory 656 may store a program or algorithm capable of controllingvarious hardware units of the electronic device 650.

FIG. 7 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

In operation 710, the wireless power transmitting device may set aplurality of directions. In order to further enhance the direction inwhich the electronic device is positioned, the wireless powertransmitting device may set more directions. In operation 720, thewireless power transmitting device may determine a patch antenna groupcorresponding to each of the plurality of directions. For example, asillustrated in FIG. 5, the wireless power transmitting device may setfour patch antennas in one group and form a RF wave for a particulardirection.

In operation 730, the wireless power transmitting device may generate asignal output to each of the patch antenna groups respectivelycorresponding to the plurality of directions. In operation 740, thewireless power transmitting device may insert identification informationinto each generated signal. For example, the wireless power transmittingdevice may further include a divider dividing power from the powersource to the patch antennas. The power divided by the divider may bemodulated by a preset communication scheme, and identificationinformation may be inserted into the modulated signal.

In operation 750, the wireless power transmitting device may send outthe identification information-containing signal through the patchantennas in each of the plurality of directions. The identificationinformation-containing signal may be reflected and received by thewireless power transmitting device. In operation 760, the wireless powertransmitting device may identify the identification information of thereceived signal and determine the receive signal from each of theplurality of directions. In operation 770, the wireless powertransmitting device may generate reference information or detect anelectronic device using the receive signal. For example, a plurality ofreflected signals may be received by one patch antenna in the wirelesspower transmitting device. Although the plurality of reflected signalsare received once, the wireless power transmitting device may identifythe reflected signals by identifying the identification information.

FIG. 8 is a block diagram illustrating example division of reflectedsignals according to an example embodiment of the present disclosure.

As illustrated in FIG. 8, the wireless power transmitting device mayreceive reflected signals (Hr(t)). The reflected signals (Hr(t)) areassumed to include all of a reflected signal of a first pilot signal anda reflected signal of a second pilot signal through a reflected signalof a Nth pilot signal.

The wireless power transmitting device may include a plurality of delaycomponents 801, 802, . . . , 80N. Here, the delay components 801, 802, .. . , 80N, respectively, may delay signals by Tf, 2×Tf, N×Tf. The delaycomponents 801, 802, . . . , 80N may be ones for correcting timediversity. The wireless power transmitting device may divide thereflected signals (Hr(t)) to the delay components 801, 802, . . . , 80N,respectively. The delay components 801, 802, . . . , 80N, respectively,may delay the reflected signals (Hr(t)) by preset times.

Each delayed signal may be subject to AND operation with a code. Forexample, the signal delayed by the delay component 801 may beAND-operated with a code, a_(1,0). In the code denotation, a_(i,j), imay be the index of information indicating the pilot signal, and j maybe the index of information for correcting time diversity. For example,the wireless power transmitting device may send out a pilot signalcontaining the identification information of a_(i) in an ith direction.The signals delayed by the delay components 801, 802, . . . , 80N may beAND-operated with codes, a_(1,0), a_(1,1), a_(1,N-1), and results of theAND operation may be added up by an adder 820. The result added by theadder 820 may be delayed by T_(e)-NTf by the delay component 831,wherein T_(e)-NTf may be a mean delay value. Accordingly, a reflectedsignal H₀ corresponding to a zeroth direction may be obtained. Forexample, the reflected signal H₀ may be a time diversity-correctedvalue, and an exact reflected signal may be obtained. In a similar wayto that described above, the results respectively added by the adders821 and 822 may be delayed as long as T_(e)-NTf by the delay components832 and 833. Accordingly, reflected signals H₁ to H_(N-1) respectivelycorresponding to the firth direction to the N−1th direction may beobtained. As set forth above, although a plurality of reflected signalsare simultaneously received by one antenna, the wireless powertransmitting device may differentiate among the reflected signalsrespectively corresponding to the pilot signals. It will readily beappreciated by one of ordinary skill in the art that the above-describedscheme is merely an example and that methods of simultaneously receivinga plurality of signals are not limited.

FIG. 9 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

In operation 910, the wireless power transmitting device may set aplurality of directions. In operation 920, the wireless powertransmitting device may determine a patch antenna group corresponding toeach of the plurality of directions. In operation 930, the wirelesspower transmitting device may generate a signal output to each of thepatch antenna groups respectively corresponding to the plurality ofdirections.

In operation 940, the wireless power transmitting device may send outeach generated signal at a different frequency. For example, thewireless power transmitting device may modulate a signal output to eachpatch antenna to have a different frequency. The signals modulated tohave different frequencies may be input to the patch antennas,respectively, and accordingly, the patch antennas, respectively, maysend out signals having different frequencies in different directions.

In operation 950, the wireless power transmitting device may receivereflected signals at each of the frequencies, respectively. For example,the wireless power transmitting device may further include a pluralityof filters respectively passing through different-frequency signals.After dividing the received signals into a plurality of paths, thewireless power transmitting device may conduct filtering to receive thereflected signals at the frequencies, respectively. In operation 960,the wireless power transmitting device may generate referenceinformation or detect an electronic device using the receive signal.

FIG. 10 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

In operation 1010, the wireless power transmitting device may set aplurality of directions. In operation 1020, the wireless powertransmitting device may determine a time period corresponding to each ofa plurality of directions. In operation 1030, the wireless powertransmitting device may send out signals output to the patch antennagroups during time periods, respectively. In operation 1040, thewireless power transmitting device may receive the reflected signalsduring the time periods, respectively. For example, the wireless powertransmitting device may send out a sub-RF wave, e.g., a pilot signal, ina first direction during a first time period. The wireless powertransmitting device may receive a reflected signal during a second timeperiod. The signal received during the second time period may be areflected signal of the pilot signal sent out in the first direction.Thereafter, the wireless power transmitting device may send out a pilotsignal in a second direction during a third time period. The wirelesspower transmitting device may receive a reflected signal of the pilotsignal sent out in the second direction during a fourth time period. Inoperation 1050, the wireless power transmitting device may generatereference information or detect an electronic device using the receivesignal.

FIG. 11 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

In operation 1110, the wireless power transmitting device may send outpilot signals in a plurality of directions, receive reflected signals,and generate and store reference information for the plurality ofdirections. In operation 1120, the wireless power transmitting devicemay send out pilot signals in multiple directions. In operation 1130,the wireless power transmitting device may receive reflected signalsrespectively corresponding to the plurality of directions.

In operation 1140, the wireless power transmitting device may determinewhether a difference is detected between the reflected signal andreference information in a particular direction. The wireless powertransmitting device may determine whether a difference between at leastone of the amplitude, phase, and time of flight, which arecharacteristics of the reflected signal, and at least one of theamplitude, phase, and time of flight of the reference informationexceeds a preset threshold.

Upon determining that the difference between the reflected signal andthe reference information is detected in a particular direction, thewireless power transmitting device, in operation 1150, may determinewhether a communication signal is received from a target for detection.

When a communication signal is received, the wireless power transmittingdevice, in operation 1160, may determine that the target for detectionis the electronic device and proceed with a wireless charging procedure.When no communication signal is received, the wireless powertransmitting device, in operation 1170, may determine that the targetfor detection is not a target for charging and update the referenceinformation. For example, the wireless power transmitting device maystore the reference information indicating that a signal attenuation inthe fourth direction is −4.1 dB, a phase variation is −3 rad, and a timeof flight is 0.28 μs, as shown in Table 1. The wireless powertransmitting device may determine that the reflected signal is subjectto a signal attenuation of −1.2 dB, a phase variation of 40 rad, and atime of flight of 0.12 μs, as compared with the pilot signal. As setforth above, the wireless power transmitting device may detect a targetfor detection in the fourth direction. When no communication signal isreceived, the wireless power transmitting device may determine that thetarget for detection is an obstacle and update the reference informationin the fourth direction as shown in Table 2.

TABLE 2 Amplitude Phase attenuation variation Time of flight Direction(dB) (rad) (μs) First direction −2 +13 0.12 Second −4 −2 0.24 directionThird −3 +17 0.15 direction Fourth −1.2 40 0.12 direction

Accordingly, the wireless power transmitting device may adaptivelymanage the reference information even though the topography of the areais varied.

FIG. 12A is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

In operation 1210, the wireless power transmitting device may send outpilot signals in multiple directions. In operation 1220, the wirelesspower transmitting device may receive reflected signals respectivelycorresponding to the plurality of directions. In operation 1230, thewireless power transmitting device may detect a difference between thereflected signal and the reference information.

In operation 1240, the wireless power transmitting device may form a RFwave corresponding to the position where a difference has been detected.For example, the wireless power transmitting device may determine thedirection in which the difference has occurred. The wireless powertransmitting device may additionally determine the distance to thetarget for detection based on the time of flight. Accordingly, thewireless power transmitting device may determine the position of thetarget for detection and control at least one of the phase and amplitudeof each of the patch antennas so that sub-RF waves constructivelyinterfere with each other at the position of the target for detection.Or, where the target for detection is the electronic device, thewireless power transmitting device may receive a communication signalfrom the electronic device. According to an example embodiment of thepresent disclosure, the communication signal may include at least one ofthe amplitude of the time of transmission and the time stamp of the timeof transmission. The wireless power transmitting device may compare theamplitude of the time of transmission of the communication signal withthe amplitude of the time of reception of the communication signal anddetermine the distance to the electronic device depending on the degreeof attenuation. Or, the wireless power transmitting device may determinethe distance to the electronic device based on a difference between thetime stamp of the time of transmission and the time of reception of thecommunication signal.

FIG. 12B is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure. The embodiment illustrated in FIG. 12B isdescribed in greater detail with reference to FIG. 13. FIG. 13 is adiagram illustrating example formation of a RF wave by a wireless powertransmitting device according to an example embodiment of the presentdisclosure.

Operations 1210 to 1230 may be similar to those of FIG. 12A. Inoperation 1241, the wireless power transmitting device may sequentiallyform a plurality of RF waves for detection for detecting the electronicdevice, corresponding to the direction where a difference between thereflected signal and the reference information has been detected. Inoperation 1250, the wireless power transmitting device may adjust the RFwaves using RX power-related information received from the electronicdevice. In operation 1260, the wireless power transmitting device maymaintain the formation of the RF waves when the received power-relatedinformation meets a preset condition. In other words, the wireless powertransmitting device may adjust the RF waves until the receivedpower-related information meets the preset condition.

As illustrated in FIG. 13, the wireless power transmitting device 1300may determine at least one of the phase and amplitude for each patchantenna 1311 to 1326 to form RF waves for detection in a determineddirection (θ,φ) where the difference has been detected. For example,upon determining that the electronic device 1350 is positionedrelatively in a right direction, the wireless power transmitting device1300 may apply a relatively large delay to patch antennas positionedrelatively at a left side so that the sub-RF waves respectivelygenerated from the plurality of patch antennas 1311 to 1326 mayconstructively interfere with each other relatively at a right side.Also, upon determining that the electronic device 1350 is positionedrelatively at an upper side from the wireless power transmitting device1300, the wireless power transmitting device 1300 may apply a relativelylarge delay to patch antennas positioned relatively at an upper side sothat the sub-RF waves respectively generated from the plurality of patchantennas 1311 to 1326 may constructively interfere with each otherrelatively at an upper side. The wireless power transmitting device 1300may apply different delays to the patch antennas 1311 to 1326,respectively, arranged in two-dimension (2D), allowing the RF wavegenerated by each of the patch antennas 1311 to 1326 to have a differentphase.

The wireless power transmitting device 1300 may determine the magnitudeof power applied to each patch antenna 1311 to 1326 so that a RF wave1331 for detection is formed corresponding to a first test distance.According to an embodiment of the present disclosure, the wireless powertransmitting device 1300 may directly determine the magnitude of firsttest power provided to the plurality of patch antennas 1311 to 1326without determining distance. Here, the first test distance or themagnitude of the first test power may have a default value.

The wireless power transmitting device 1300 may form a RF wave 1331corresponding to the first test distance using the determined powerapplied to each patch antenna 1311 to 1326 and at least one of thedetermined phase and amplitude for each patch antenna 1311 to 1326.

The wireless power transmitting device 1300 may receive RX power-relatedinformation from the electronic device 1350. The wireless powertransmitting device 1300 may determine whether the receivedpower-related information meets a preset condition. For example, thewireless power transmitting device 1300 may determine whether thevoltage at the output end of the rectifier of the electronic device1350, which is the received power-related information, exceeds a presetthreshold.

When the received power-related information fails to meet the presetcondition, the wireless power transmitting device 1300 may adjust thepower applied to each patch antenna 1311 to 1326 to form a RF wave 1332for detection corresponding to a next test distance. As set forth supra,the wireless power transmitting device 1300 may determine the magnitudeof next test power immediately without determining a test distance andapply the same to each patch antenna 1311 to 1326. Meanwhile, althoughFIG. 13 illustrates that the wireless power transmitting device 1300increases the test distance in the example embodiment, this is merely anexample. The wireless power transmitting device 1300 may also reduce thetest distance. Meanwhile, the wireless power transmitting device 1300may adjust the magnitude of power applied to each patch antenna 1311 to1326 until the received power-related information meets the presetcondition. For example, the wireless power transmitting device 1300 mayadjust the magnitude of the power applied to each patch antenna 1311 to1326 until the voltage at the output end of the rectifier of theelectronic device 1350 reports a value exceeding a preset threshold.

When the received power-related information meets the preset condition,the wireless power transmitting device 1300 may maintain the powerapplied to each patch antenna to send out a RF wave and perform wirelesscharging. In the embodiment illustrated in FIG. 13, where a RF wave 1333is formed to have a third test distance, the received power-relatedinformation may be determined to be met. The wireless power transmittingdevice 1300 may maintain the magnitude of power applied to each patchantenna 1311 to 1326 so as to maintain the formation of the RF wave 1333in the third test distance. The wireless power transmitting device 1300may determine that the distance to the electronic device 1350 is thethird test distance R or may control only power applied to each patchantenna 1311 to 1326 without determination as to the distance to theelectronic device 1350.

FIG. 14 is a flowchart illustrating example charging of a plurality ofelectronic devices according to an example embodiment of the presentdisclosure. The embodiment related to FIG. 14 is described in greaterdetail with reference to FIGS. 15A, 15B and 15C. FIGS. 15A and 15B areplan views illustrating an area including a wireless power transmittingdevice according to an example embodiment of the present disclosure.FIG. 15C is a view illustrating a charging period and a detection periodaccording to an example embodiment of the present disclosure.

In operation 1410, the wireless power transmitting device may charge afirst electronic device during a charging period. For example, asillustrated in FIG. 15A, the wireless power transmitting device 401 mayform a RF wave 1501 corresponding to the position of the electronicdevice 450.

In operation 1420, the wireless power transmitting device may send out aplurality of pilot signals in a plurality of directions, respectively,during a detection period. For example, as illustrated in FIG. 15B, thewireless power transmitting device 401 may stop forming the RF wave 1501and send out a pilot signal 1511. Although FIG. 15B illustrates that thewireless power transmitting device 401 sends out one pilot signal 1511,this is merely an example for ease of description. The wireless powertransmitting device 401 may send out pilot signals in a plurality ofdirections as illustrated in FIG. 4B. The wireless power transmittingdevice 401 may receive a reflected signal 1512 of the pilot signal 1511.

In operation 1430, the wireless power transmitting device may determinewhether a second electronic device is additionally detected during thedetection period. For example, as illustrated in FIG. 15B, the wirelesspower transmitting device 401 may receive the reflected signal 1512 andcompare the reflected signal 1512 with reference information toadditionally detect the second electronic device 460.

In operation 1440, the wireless power transmitting device may determinethe position, e.g., direction and distance d10, of the second electronicdevice during the detection period. Or, the wireless power transmittingdevice may adjust and form a RF wave for the second electronic device460 without determining the distance, d10, until the receivedpower-related information meets a preset condition. In operation 1450,the wireless power transmitting device may charge the first electronicdevice and the second electronic device during a charging period.According to an example embodiment of the present disclosure, thewireless power transmitting device may determine a patch antenna groupfor charging each of the plurality of electronic devices. The wirelesspower transmitting device may wirelessly charge the plurality ofelectronic devices using the patch antenna groups. In other words, thewireless power transmitting device may divide the plurality of patchantennas into a patch antenna for charging the first electronic deviceand a patch antenna for charging the second electronic device and mayperform charging. Or, the wireless power transmitting device may chargethe plurality of electronic devices by charging the first electronicdevice during a first charging period and the second electronic deviceduring a second charging period.

FIG. 15C is a view illustrating an example of a charging period and adetection period according to an example embodiment of the presentdisclosure.

Referring to FIG. 15C, the wireless power transmitting device may sendout power of, e.g., a magnitude of P0, during a first charging period.Here, the magnitude of P0 may be the magnitude of power for charging thefirst electronic device. Meanwhile, when the charging period ends, thewireless power transmitting device may enter into a detection period.The wireless power transmitting device may send out pilot signals in aplurality of directions during a detection period for transmission. Themagnitude P1 may be the magnitude of a pilot signal. The wireless powertransmitting device may control each patch antenna to receive areflected signal during a detection period for reception. The wirelesspower transmitting device may detect the second electronic device byanalyzing the reflected signal. The wireless power transmitting devicemay re-enter into the charging period and send out power of a magnitudeof P2. Here, the magnitude of P2 may be the magnitude of power forcharging the first electronic device and the second electronic device.The wireless power transmitting device may re-enter into the detectionperiod and send out a pilot signal and receive a reflected signal. Theduration of the charging period and detection period may be adjusted.

Meanwhile, what is illustrated in FIG. 15C is merely an example.According to an example embodiment of the present disclosure, thewireless power transmitting device may also send out a pilot signal fordetection upon aperiodically detecting a particular event.

FIG. 16 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure. The embodiment of FIG. 16 is described ingreater detail with reference to FIGS. 17A and 17B. FIGS. 17A and 17Bare plan views illustrating an area including a wireless powertransmitting device according to an example embodiment of the presentdisclosure.

In operation 1610, the wireless power transmitting device 401 may chargethe electronic device 450 during a charging period. As set forth above,the wireless power transmitting device 401 may determine at least one ofthe direction and position of the electronic device 450 as it previouslysends out a pilot signal and receives a reflected signal and may conductcharging using the same. For example, as illustrated in FIG. 17A, thewireless power transmitting device 401 may form a RF wave 1501corresponding to the position of the electronic device 450. Meanwhile,an obstacle 470 is assumed to be positioned between the wireless powertransmitting device 401 and the electronic device 450 during the courseof charging.

In operation 1620, the wireless power transmitting device 401 may sendout a plurality of pilot signals in a plurality of directions,respectively, during a detection period. Although not shown, thewireless power transmitting device 401 may send out a plurality of pilotsignals in a plurality of directions and receive reflected signalscorresponding thereto. In operation 1630, the wireless powertransmitting device 401 may determine whether an additional target fordetection is detected during the detection period.

In operation 1640, the wireless power transmitting device 401 maydetermine whether the target for detection is another electronic device.For example, the wireless power transmitting device 401 may determinewhether the target is the electronic device depending on whether acommunication signal is received from the target for detection. When nocommunication signal is received, the wireless power transmitting device401 may determine that the target for detection is an obstacle 470.

In operation 1650, the wireless power transmitting device 401 maydetermine whether the direction in which the target for detectioncorresponds to the direction in which the existing electronic device 450used to perform charging is positioned. As described above, the wirelesspower transmitting device 401 may previously determine the direction inwhich the electronic device 450 is positioned and may determine thedirection in which the target for detection, e.g., the obstacle 470, ispositioned according to the transmission of the pilot signal and thereception of the reflected signal in operation 1630. When a differencebetween the direction in which the electronic device 450 is positionedand the direction in which the obstacle 470 is positioned is less than apreset threshold, the wireless power transmitting device 401 maydetermine that the direction in which the obstacle 470 is positionedcorresponds to the direction in which the electronic device 450 ispositioned. Here, the preset threshold may previously be set to thedegree by which the obstacle 470 may affect the charging of theelectronic device 450. As illustrated in FIG. 17A, where the obstacle470 is positioned on the path along which the RF wave 1501 is formed,the obstacle 470 may absorb part of the RF wave 1501, causing adeterioration of charging efficiency.

In operation 1660, the wireless power transmitting device 401 may chargethe electronic device 450 while avoiding the target for detection, e.g.,the obstacle 470. For example, as illustrated in FIG. 17B, the wirelesspower transmitting device 401 may form a RF wave 1701 in a directiondifferent from an existing one. The RF wave 1701 may be sent out fromthe wireless power transmitting device 401, reflected by a structure,e.g., a wall, and then propagate to the electronic device 450.Accordingly, the electronic device 450 may be wirelessly charged withoutinfluence from the obstacle 470.

In operation 1670, the wireless power transmitting device 401 may updatereference information. The wireless power transmitting device 401 mayreflect the characteristic of the reflected signal for the direction inwhich the obstacle 470 is positioned to the reference information.Further, the wireless power transmitting device 401 may also storeinformation about a detour path associated with the direction in whichthe obstacle 470 is positioned. Thus, upon determining later thatanother electronic device is positioned in the direction along which theobstacle 470 is positioned, the wireless power transmitting device 401may form the RF wave 1701 through the detour path, not in thecorresponding direction.

In operation 1680, where the target for detection is determined to bethe second electronic device, the wireless power transmitting device maycharge both the first electronic device and the second electronicdevice.

FIG. 18 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure. The embodiment of FIG. 18 is described ingreater detail with reference to FIGS. 19A and 19B. FIGS. 19A and 19Bare plan views illustrating an area including a wireless powertransmitting device according to an example embodiment of the presentdisclosure.

In operation 1810, the wireless power transmitting device 401 may chargethe electronic device 450 during a charging period. For example, thewireless power transmitting device 401 may detect the presence of adifference between the reference information and the signalcharacteristic of the reflected signal of the pilot signal for thefourth direction during the previous detection period and may thencharge the electronic device 450 positioned in the fourth direction. Inoperation 1820, the wireless power transmitting device 401 may send outa plurality of pilot signals in a plurality of directions, respectively,during a detection period.

In operation 1830, the wireless power transmitting device 401 may detecta move of the electronic device 450 during the detection period. Forexample, the wireless power transmitting device 401 may detect thepresence of a difference between the reference information and thecharacteristic of the reflected signal of the pilot signal for the fifthdirection during the detection period. Additionally, the wireless powertransmitting device 401 may detect the absence of a difference betweenthe existing reference information and the characteristic of thereflected signal of the pilot signal for the fourth direction.Accordingly, the wireless power transmitting device 401 may determinethat the electronic device 450 moves in the fifth direction. Accordingto an embodiment of the present disclosure, the wireless powertransmitting device 401 may determine the move of the electronic device450 using move information directly received from the electronic device450. According to an embodiment of the present disclosure, the wirelesspower transmitting device 401 may determine the move of the electronicdevice 450 based on the direction of reception of a communication signalreceived from the electronic device 450. The wireless power transmittingdevice 401 may also determine the move of the electronic device 450using various positioning methods, such as time difference of arrival(TDOA) or frequency difference of arrival (FDOA).

In operation 1840, the wireless power transmitting device 401 maydetermine whether there is an obstacle between the electronic device 450and the wireless power transmitting device 401. For example, asillustrated in FIG. 19A, an obstacle 1910 may be positioned at a lowerside of the wireless power transmitting device 401. The wireless powertransmitting device 401 may store the signal characteristic for thedirection in which the obstacle 1910 is positioned upon generating thereference information. The wireless power transmitting device 401 maydetermine whether the obstacle 1910 is positioned by comparing thedirection in which the obstacle 1910 is positioned with the post-movedirection of the electronic device 450. Where the electronic device 450moves in an upper direction 1901, the wireless power transmitting device401 may detect the electronic device 450 in the direction in which apiece of furniture 412 is positioned. In this case, since the directionin which the electronic device 450 is positioned differs from thedirection in which the obstacle 1910 is positioned, the wireless powertransmitting device 401 may determine that the obstacle 1910 is notpositioned in the direction of the electronic device 450. Where theelectronic device 450 moves in a left direction 1902, the wireless powertransmitting device 401 may detect the electronic device 450 in thedirection in which the obstacle 1910 is positioned. In this case, sincea difference between the direction in which the electronic device 450and the direction in which the obstacle 1910 is positioned may be lessthan a preset threshold, the wireless power transmitting device 401 maydetermine that the obstacle 1910 is positioned in the direction of theelectronic device 450.

Upon determining that no obstacle is positioned between the electronicdevice 450 and the wireless power transmitting device 401, the wirelesspower transmitting device 401 may charge the electronic device 450,corresponding to the moved position, in operation 1870. Upon determiningthat an obstacle is positioned between the electronic device 450 and thewireless power transmitting device 401, the wireless power transmittingdevice 401 may charge the electronic device 450 while avoiding theobstacle 1910 in operation 1850. For example, as illustrated in FIG.19B, the wireless power transmitting device 401 may charge theelectronic device 450 while avoiding the obstacle 1910 by forming the RFwave 1920 through a detour path.

In operation 1860, the wireless power transmitting device 401 may updatethe reference information by reflecting the moved position of theelectronic device 450 to the reference information.

As set forth above, the wireless power transmitting device 401 mayperform wireless charging while tracking movement of the electronicdevice 450.

FIG. 20 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

In operation 2010, the wireless power transmitting device may send out aplurality of pilot signals in a plurality of directions, respectively,during a detection period. In operation 2020, the wireless powertransmitting device may detect a difference between the reflected signaland the reference information. In operation 2030, the wireless powertransmitting device may determine move information about the electronicdevice using at least one of information about a reflected signal andmove-related information from the electronic device. For example, thewireless power transmitting device may periodically or aperiodicallyreceive move information from the electronic device. The electronicdevice may include various sensors, such as a gyro sensor, a 3-axisacceleration sensor, or a geo-magnetic sensor, capable of a motion ofthe electronic device, and the electronic device may send out moveinformation determined based on a value sensed by the sensor to thewireless power transmitting device. The wireless power transmittingdevice may more exactly determine the post-move position of theelectronic device using the move information about the electronicdevice, as well as the direction where a difference from the referenceinformation has been detected.

FIG. 21 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

In operation 2110, the wireless power transmitting device may determinethe direction in which the electronic device is positioned. As describedabove, the wireless power transmitting device may determine thedirection in which the electronic device is positioned by sending out apilot signal in a detection period, receiving a reflected signal, andcomparing the characteristic of the reflected signal with referenceinformation. In operation 2120, the wireless power transmitting devicemay determine that an obstacle is present between the electronic deviceand the wireless power transmitting device.

In operation 2130, the wireless power transmitting device may charge theelectronic device through a detour path along which the obstacle isavoided. The wireless power transmitting device may form a RF wave alongthe path of avoidance in various manners, which is described below ingreater detail.

FIG. 22 is a flowchart illustrating an example method for forming a RFwave through an avoidance path according to an example embodiment of thepresent disclosure. The embodiment of FIG. 22 is described in greaterdetail with reference to FIGS. 23A and 23B. FIGS. 23A and 23B are planviews illustrating an area including a wireless power transmittingdevice according to an example embodiment of the present disclosure.

In operation 2210, as illustrated in FIG. 23A, the wireless powertransmitting device 2301 may determine the direction in which theelectronic device 2303 is positioned. For example, the wireless powertransmitting device 2301 may send out a pilot signal 2311 during adetection period and receive a reflection of the pilot signal 2311 onthe electronic device 2303. The wireless power transmitting device 2301may determine the direction in which the electronic device 2303 ispositioned based on a difference between the reference information andthe characteristic of the reflected signal. Meanwhile, the wirelesspower transmitting device 2301 may store, as reference information, thesignal characteristic of the reflected signal of the pilot signal forthe direction of the obstacle 2302.

In operation 2220, the wireless power transmitting device 2301 maydetermine that there is an obstacle 2302 between the electronic device2303 and the wireless power transmitting device 2301. When a differencebetween the direction 2303 in which the electronic device 2303 ispositioned and the direction in which the obstacle 2302 is positioned isless than a preset threshold, the wireless power transmitting device2301 may determine that the obstacle 2302 is present between theelectronic device 2303 and the wireless power transmitting device 2301.

In operation 2230, the wireless power transmitting device 2301 may forma RF wave in a direction different from the existing path. For example,as illustrated in FIG. 23A, the wireless power transmitting device 2301may vary the direction of formation of the RF wave 2312. The wirelesspower transmitting device 2301 may vary the direction of formation ofthe RF wave by adjusting at least one of the phase and amplitude of eachof the plurality of phase and amplitudes. According to an embodiment ofthe present disclosure, the wireless power transmitting device 2301 mayvary the direction of formation of the RF wave 2312 to a presetdirection. For example, the wireless power transmitting device 2301 maybe configured to move the direction of formation of RF wave by twodirection units.

In operation 2240, the wireless power transmitting device 2301 mayreceive RX power-related information from the electronic device 2303.Further, the wireless power transmitting device 2301 may determinewhether the received power-related information meets a preset condition.For example, the wireless power transmitting device 2301 may determinewhether the voltage at the output end of the rectifier in the electronicdevice 2303 exceeds a preset threshold.

Upon determining that the received power-related information meets apreset threshold, the wireless power transmitting device 2301 maycontinue forming the RF wave in operation 2250. Unless the receivedpower-related information is determined to meet the preset condition,the wireless power transmitting device 2301 may form a RF wave in adirection different from the existing path. For example, as illustratedin FIG. 23B, the wireless power transmitting device 2301 may re-adjustthe direction of formation of the RF wave 2313. In this case, the RFwave 2313 may be reflected by a wall and delivered to the electronicdevice 2303. Accordingly, the wireless power transmitting device 2301may charge the electronic device 2303 without influence from theobstacle 2302. In this case, the received power-related information ofthe electronic device 2303 may meet the preset condition. The wirelesspower transmitting device 2301 may receive the received power-relatedinformation from the electronic device 2303. The received power-relatedinformation may meet the preset condition. The wireless powertransmitting device 2301 may keep on forming the RF wave 2313corresponding to the meeting of the preset condition. Further, thewireless power transmitting device 2301 may store an avoidance pathcorresponding to the position of the electronic device 2303, e.g., acondition for forming the RF wave 2313. Accordingly, where anotherelectronic device is detected later at the position of the electronicdevice 2303, the wireless power transmitting device 2301 may immediatelyform a RF wave 2303 without an additional procedure.

FIGS. 24A and 24 b are diagrams illustrating an example method fordetecting an obstacle. The wireless power transmitting device 2410 mayinclude a communication antenna 2411. The electronic device 2450 mayinclude a plurality of communication antennas 2451 and 2452. A firsttime Δt1 may be required until a first communication signal sent out bythe communication antenna 2451 is received by the communication antenna2411. A second time Δt2 may be required until a second communicationsignal sent out by the communication antenna 2452 is received by thecommunication antenna 2411. Unless an obstacle is positioned between theelectronic device 2450 and the wireless power transmitting device 2410,a difference between the first time Δt1 and the second time Δt2 is ofless significance. On the other hand, an obstacle 2460 may be positionedbetween the wireless power transmitting device 2410 and the electronicdevice 2450 as illustrated in FIG. 24B. In such case, communicationsignals may be received by the communication antenna 2411 by gettingaround the obstacle 2460. Thus, a third time Δt3 may be required untilthe first communication signal sent out by the communication antenna2451 is received by the communication antenna 2411. A fourth time Δt4may be required until the second communication signal sent out by thecommunication antenna 2452 is received by the communication antenna2411. In this case, a difference between the third time Δt3 and thefourth time Δt4 may be relatively large. This is attributed to adifference in path between the first communication signal and the secondcommunication signal. As a result, upon determining that a gap in timeof reception between the first communication signal and the secondcommunication signal is larger than a preset threshold, the wirelesspower transmitting device 2410 may determine that the obstacle 2460 ispositioned between the electronic device 2450 and the wireless powertransmitting device 2410.

FIG. 25 is a flowchart illustrating an example method for detecting anobstacle according to an example embodiment of the present disclosure.

In operation 2510, the wireless power transmitting device may receive afirst transmit signal from a first antenna of the electronic device at afirst time. In operation 2520, the wireless power transmitting devicemay receive a second transmit signal from a second antenna of theelectronic device at a second time. According to an embodiment of thepresent disclosure, the electronic device may be configured to firstsend out the first transmit signal through the first antenna, and apreset time after, the second transmit signal through the secondantenna. The wireless power transmitting device may previously store thepreset time. The first transmit signal and the second transmit signal,respectively, may include identification information indicating thatthey, respectively, have been sent out from the first antenna and thesecond antenna.

In operation 2530, the wireless power transmitting device may determinewhether a difference between the first time of reception and the secondtime of reception exceeds a preset threshold. As described in connectionwith FIGS. 24A and 24B, where no obstacle is present, the differencebetween the first time of reception and the second time of receptionmight be of little difference from the preset time. In other words, whenno obstacle is present, the first transmit signal and the secondtransmit signal may be received substantially at the same time. Thepreset threshold may be set to be a value obtained by adding, to thepreset time, a value allowing the first transmit signal and the secondtransmit signal to be determined to have been received substantially atthe same time.

Upon determining that the difference between the first time of receptionand the second time of reception is in excess of the preset threshold,the wireless power transmitting device, in operation 2540, may determinethat an obstacle is positioned between the electronic device and thewireless power transmitting device. Upon determining that the differencebetween the first time of reception and the second time of reception isnot in excess of the preset threshold, the wireless power transmittingdevice may determine that no obstacle is positioned between theelectronic device and the wireless power transmitting device.

Meanwhile, according to an example embodiment of the present disclosure,the wireless power transmitting device may also determine the presenceor absence of an obstacle by determining the time of flight (TOF) ofeach communication signal. According to an embodiment of the presentdisclosure, the communication signal may include a time stamp for thetime of transmission. Accordingly, a first communication signal mayinclude a time stamp for the time of transmission of the firstcommunication signal, and the second communication signal may include atime stamp for the time of transmission of the second communicationsignal. The wireless power transmitting device may compare the time ofreception with the time of transmission of the first communicationsignal to determine a first time of flight of the first communicationsignal, and the wireless power transmitting device may compare the timeof reception with the time of transmission of the second communicationsignal to determine a second time of flight of the second communicationsignal. As set forth above in connection with FIGS. 24A and 24B, whereno obstacle is present, the first time of flight may be substantiallythe same as the second time of flight. Accordingly, the wireless powertransmitting device may determine whether there is an obstacle using adifference between the first time of flight and the second time offlight.

FIG. 26 is a flowchart illustrating an example method for controlling awireless power transmitting device according to an example embodiment ofthe present disclosure.

In operation 2610, the wireless power transmitting device may receive RXpower-related information and move information from the electronicdevice. In operation 2620, the wireless power transmitting device maydetermine whether the received RX power-related information meets apreset condition. For example, the wireless power transmitting devicemay detect that the voltage at the output end of the rectifier in theelectronic device is not more than a preset threshold. In other words,the preset condition may be a condition indicating that the electronicdevice fails to receive a sufficient amount of power.

In operation 2630, the wireless power transmitting device may determinewhether a move of the electronic device is detected. Upon determiningthat the electronic device has moved, the wireless power transmittingdevice, in operation 2640, may determine that the electronic device hasdeparted from a power transmission range of the wireless powertransmitting device. Upon determining that the electronic device hasdeparted from the power transmission range, the wireless powertransmitting device may initiate a process for discovering the positionof the electronic device.

When determining that the electronic device has not moved, the wirelesspower transmitting device, in operation 2650, may determine that anobstacle is present between the electronic device and the wireless powertransmitting device.

According to an example embodiment of the present disclosure, there isprovided a storage medium storing commands configured to be executed byat least one processor to enable the at least one processor to performat least one operation that may comprise storing, as referenceinformation, information about a first reflected signal of a pilotsignal sent out at a first time, sending out a pilot signal at a secondtime, and comparing the reference information with information aboutsecond reflected signals of the pilot signal sent out at the secondtime; and determining a position of a target for detection based on aresult of the comparison.

According to an embodiment of the present disclosure, there is provideda storage medium storing commands configured to be executed by at leastone processor to enable the at least one processor to perform at leastone operation that may comprise receiving a first communication signalfrom a first antenna of an electronic device, receiving a secondcommunication signal from a second antenna of the electronic device,determining whether an obstacle is positioned between the electronicdevice and the wireless power transmitting device using a first time ofreception of the first communication signal and a second time ofreception of the second communication signal, and upon determining thatthe obstacle is positioned between the electronic device and thewireless power transmitting device, transmitting power to the electronicdevice while avoiding the obstacle.

The above-described commands may be stored in an external server and maybe downloaded and installed on an electronic device, such as a wirelesspower transmitting device. In other words, according to an exampleembodiment of the present disclosure, the external server may storecommands that are downloadable by the wireless power transmittingdevice.

As is apparent from the foregoing description, according to variousexample embodiments of the present disclosure, there may be provided awireless power transmitting device capable of swiftly determining theposition of an electronic device by sending out pilot signals inmultiple directions and analyzing reflections thereof and a method forcontrolling the same. There are also provided a wireless powertransmitting device capable of conducting wireless charging by avoidingobstacles positioned between an electronic device and the wireless powertransmitting device and a method for controlling the same.

The various example embodiments disclosed herein are provided fordescription and understanding of the disclosed technology and does notlimit the scope of the present disclosure. Accordingly, the scope of thepresent disclosure should be understood as including all changes orvarious embodiments based on the technical spirit of the presentdisclosure.

What is claimed is:
 1. A wireless power transmitting device, comprising: an antenna; a memory; and a processor configured to: control to store, as reference information, information of a first reflected signal of a pilot signal sent out through the antenna at a first time in the memory, control to compare the reference information with information of second reflected signals of a pilot signal sent out through the antenna at a second time, and determine a position of a target for detection based on a result of the comparison.
 2. The wireless power transmitting device of claim 1, wherein the processor is configured to determine that the target for detection is positioned in a direction corresponding to at least one of the plurality of second reflected signals when a difference between the at least one of the second reflected signals and the reference information is greater than a preset threshold.
 3. The wireless power transmitting device of claim 1, wherein the processor, upon determining that the target for detection is an electronic device, is configured to control the antenna to transmit power to the electronic device using a position of the target for detection, and upon determining that the target for detection is an obstacle, the processor is configured to update the reference information to include information of the second reflected signals with the reference information.
 4. The wireless power transmitting device of claim 3, wherein the processor is configured to determine that the target for detection is the electronic device when receiving a communication signal from the target for detection and is configured to determine that the target for detection is the obstacle when receiving no communication signal from the target for detection.
 5. The wireless power transmitting device of claim 3, wherein when the processor is configured to transmit, through the antenna, other power to another electronic device before the second time, the processor is configured to determine that the target for detection is the obstacle, and when the obstacle is positioned between the wireless power transmitting device and the another electronic device, the processor is configured to adjust a direction of transmission of the other power.
 6. The wireless power transmitting device of claim 5, further comprising a communication circuit, wherein the processor is configured to receive, through the communication circuit, a communication signal including received power-related information from the other electronic device, and to adjust the direction of transmission of the other power until the received power-related information meets a preset condition.
 7. The wireless power transmitting device of claim 3, wherein when the antenna transmits other power to another electronic device before the second time, the processor, upon determining that the target for detection is the electronic device, is configured to transmit the power corresponding to a position of the electronic device and to transmit the other power corresponding to a position of the another electronic device.
 8. The wireless power transmitting device of claim 7, wherein the processor is configured to control to transmit, through a first part of the antenna, the power and to control to transmit, through a second part of the antenna, the other power.
 9. The wireless power transmitting device of claim 7, wherein the processor is configured to control to transmit, through the antenna, the power during a first time period and to control to transmit, through the antenna, the other power during a second time period.
 10. The wireless power transmitting device of claim 7, wherein the processor is configured to control to transmit, through the antenna, the other power during a charging period and to control to transmit, through the antenna, the pilot signal during a detection period.
 11. The wireless power transmitting device of claim 3, further comprising a communication circuit, wherein the processor is configured to receive, through the communication circuit, a communication signal including received power-related information of the electronic device, and control to transmit, through the antenna, the power in a direction in which the electronic device is positioned and is configured to adjust a strength of the power until the received power-related information meets a preset condition.
 12. The wireless power transmitting device of claim 1, wherein the processor is configured to update the reference information to include a signal characteristic of the second reflected signals to the reference information, to compare the reference information with information of a third reflected signal of a pilot signal sent out through the antenna at a third time, and to determine a movement of the target for detection based on a result of the comparison.
 13. The wireless power transmitting device of claim 12, wherein the processor is configured to control the antenna to transmit the power corresponding to a position of the electronic device after the movement when the target for detection is determined to be the electronic device.
 14. The wireless power transmitting device of claim 13, further comprising a communication circuit, wherein the processor is configured to receive, through the communication circuit, a communication signal including information of the movement of the electronic device and to determine the position of the electronic device after the movement further using the information of the movement of the electronic device included in the communication signal.
 15. The wireless power transmitting device of claim 1, wherein the processor is configured to control the antenna to send out the pilot signal in a plurality of directions.
 16. The wireless power transmitting device of claim 1, wherein the information includes at least one of: an amplitude, a phase, and a time of flight.
 17. A method for controlling a wireless power transmitter, the method comprising: storing, as reference information, information of a first reflected signal of a pilot signal sent out at a first time; sending out a pilot signal at a second time; and comparing the reference information with information of second reflected signals of the pilot signal sent out at the second time; and determining a position of a target for detection based on a result of the comparison.
 18. A wireless power transmitting device, comprising: a plurality of antennas; a communication circuit; and a processor configured to: control to receive, through the communication circuit, a first communication signal from a first antenna of an electronic device and to receive, through the communication circuit, a second communication signal from a second antenna of the electronic device, determine whether an obstacle is positioned between the electronic device and the wireless power transmitting device using a first time of reception of the first communication signal and a second time of reception of the second communication signal, and upon determining that the obstacle is positioned between the electronic device and the wireless power transmitting device, control to transmit, through the plurality of antennas, power to the electronic device while avoiding the obstacle.
 19. The wireless power transmitting device of claim 18, wherein the electronic device is configured to send out the second communication signal a preset time after sending out the first communication signal, and wherein the processor is configured to determine that the obstacle is positioned between the electronic device and the wireless power transmitting device when a difference between the first time of reception and the second time of reception exceeds a preset threshold.
 20. The wireless power transmitting device of claim 18, wherein the first communication signal includes information about a first time of transmission, and the second communication signal includes information about a second time of transmission, and wherein the processor is configured to determine a first time of flight of the first communication signal using the first time of transmission and the first time of reception, to determine a second time of flight of the second communication signal using the second time of transmission and the second time of reception, and to determine that the obstacle is positioned between the electronic device and the wireless power transmitting device when a difference between the first time of flight and the second time of flight exceeds a preset threshold. 